Qingdao Rinborn Machinery Co., Ltd.
+86 186 6184 7678
RMC Foundry is a China-based manufacturer specializing in precision metal casting and CNC machining for global OEM industries. Our capabilities include sand casting, investment casting, shell mold casting, lost foam casting, vacuum casting, machining, heat treatment, and surface finishing. We produce ferrous and non-ferrous metal parts used in industrial equipment, automotive, pumps, valves, agriculture, construction machinery, and energy applications.
Advanced Manufacturing Capabilities
RMC operates integrated casting and machining workshops with modern production equipment and engineering software. This allows us to manufacture complex and high-precision metal parts with stable quality.
Strict Quality Control
Quality inspection is applied from raw materials to final machining. Chemical analysis, dimensional inspection, and process audits help ensure every batch meets customer specifications and traceability requirements.
Flexible OEM Manufacturing
We support custom production based on drawings, samples, or technical requirements. Our engineering team works closely with customers to improve manufacturability and reduce production costs.
One-Stop Production Service
From tooling and casting to machining, heat treatment, surface treatment, and logistics, RMC provides complete manufacturing support to simplify supply chain management for overseas buyers.
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Item |
Specification |
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Max Size |
1,500 mm × 1,000 mm × 500 mm |
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Weight Range |
0.5 kg – 500 kg |
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Annual Capacity |
5,000 – 6,000 Tons |
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Tolerances |
Standard or Custom on Request |
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Mold Materials |
Green Sand Casting, Shell Mold Sand Casting |
The sand castings produced by our company mainly include the following types:
Cast Iron Sand Casting Components
Cast iron sand casting components are metal parts created by pouring molten iron (gray, ductile, or malleable) into compacted sand molds. This cost-effective process produces versatile, durable parts like engine blocks, pipes, and machinery bases, ranging from small to massive sizes.
Gray Iron Green Sand Casting Product
Gray Iron Green Sand Casting Product is a durable metal component made by pouring molten gray iron into a mold made of compressed "green" sand (a moist mixture of sand, clay, and additives).
Metal Sand Casting Parts
Metal sand casting parts are metal components—commonly iron, steel, aluminum, or bronze—created by pouring molten metal into a sand-based mold. Known for flexibility, cost-effectiveness, and suitability for large or complex shapes, this process uses patterns to create molds, often in two halves (cope and drag).
Nearly Any Alloy
Sand castings can be readily produced in nearly any ferrous or non-ferrous alloy. Some other casting processes will melt and pour super-alloys in a vacuum, but that is not typically done as a sand casting.
Low Tooling Cost
The relatively low cost of tooling makes sand casting a process of choice for lower volume needs. Patterns do wear so the material selected for the pattern (typically wood, plastic, or metal) will depend on the expected usage quantity of the part being produced.
Versatile – Size, Weight, Shape
Sand castings can be produced in weights from ounces to 200+ tons. Through the use of cores, internal structures can be cast in place. Shaped parts rely mainly on the imagination of the designer.
Any Quantity
Because the tooling cost can be minimal, sand casting may be appropriate for a single piece run. Alternatively, there are automotive components that are produced using this process, so it may also be used in high volume applications.
Timing
The casting process itself may be quicker than some others, like investment casting, but it is important to consider the post-casting processes like machining that may be required when computing total lead times.
Construction Equipment and Architectural Castings
From industrial jobsite equipment to architectural castings, the modern construction sector finds many uses for sand cast components:
Construction machinery parts
Door furniture
Decorative end pieces for aluminum extrusions
Decorative metal art
Jobsite equipment and installations
Industrial Castings and Factory Equipment
From critical machinery parts to safety covers, cases and boxes, custom castings are found throughout the modern factory floor:
Air compressor pistons and parts
Cast blowers and impellers
Explosion-proof electrical covers and boxes
Heavy machinery parts
Housings for industrial electronics
Industrial bearing and bushing components
Industrial pistons and bump bodies
Industrial valves and fittings
Sand Casting for the Oil, Gas, and Energy Industry
Out in the oilfield, in gas processing, and throughout the wind sector, cast components are critical to some of the energy industry’s most state-of-the-art systems:
Cast valve bodies in oil pipes
Explosion-proof electrical boxes for power plants
Heavy machinery for oil and gas extraction
Oilfield installation equipment
Pistons, pump bodies, and various hydraulic equipment
Power generator parts
Tanks for gas/oil storage and transport
Turbine components
Aluminum
Aluminium is one of the most commonly used sand casting materialsdue to its mechanical properties. It has a high strength to weight ratio, low density, corrosion resistance and castability.
Bronze
Bronze, an alloy of copper and tin, is a common material for sand casting.The sand casting of bronze depends on its different alloys, which are based on the ratio of copper to tin or the presence of other elements such as aluminium, zinc, nickel and iron.
Brass
Brass is an alloy of copper and zinc which, due to its high elemental content, is resistant to rust and corrosion. Brass does not contain iron or iron oxide. Brass has good electrical conductivity and tensile strength.
Zinc
Zinc is a strong material with high hardness, corrosion resistance and castability. In addition, the strength and hardness of zinc makes it easy to produce thinner walled parts after alloying.
Lead
Lead was one of the most commonly used materials for sand casting by the Romans. It is heavy and resistant to corrosion.
Copper
Copper is an expensive, strong, heavy material known for its electrical and thermal conductivity. Because copper does not rust and is highly malleable, it is suitable for sand casting, such as plumbing fixtures.
Iron
Iron is commonly used in sand casting due to its fluidity and low volumetric/linear shrinkage. However, its poor mechanical properties, high compressive strength and low tensile strength make it unsuitable for parts with complex shapes or asymmetric structures.
Mild Steel
Mild steel has a lower carbon content (0.15% to 0.30%), which gives it greater ductility and malleability.Mild steel is widely used because of its low cost and ease of casting.
Stainless Steel
Stainless steel’s corrosion resistance, durability and strength make it a popular choice for sand casting. It also has a low coefficient of thermal expansion, which improves precision, high tolerances and dimensional stability.
Equipment Required for Sand Castings
Sand mixing equipment
Sand mixing machine is used to mix sand (special modeling soil) and appropriate amount of clay evenly to prepare sand mold materials suitable for casting.
Mold making equipment
Engraving machine, used to make molds based on samples or drawings provided by customers. Engraving machines can engrave materials such as wood, plastic sheets, and metal blocks to create precise molds.
Core making equipment
Oven, used for firing cores. For castings with internal cavities, a core needs to be made to fill the cavity in the mold. In addition,materials such as aluminum core boxes and coated sand are also required.
Molding equipment
Molding machine, used to compress the mixed sand material and shape it around the mold. The molding machine can greatly improve the molding efficiency and reduce the workload of workers.
Melting Equipment
Electric furnace, used to melt metal. The size and power of the electric furnace are determined by production needs.
Pouring equipment
Ladle, used to contain and transfer molten metal. There are large and small ladles for molten iron to facilitate the transfer of molten metal from the electric furnace to the mold.
Cleaning equipment
Sandblasting machine,used to clean sand and impurities on the surface of castingsand perform surface roughening.
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Material Selection |
Carbon Steel, Stainless Steel, Alloy Steel, Ductile Iron, Gray Iron |
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Casting Size |
Small to large sand castings up to 1,500 mm |
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Weight Range |
0.5 kg – 500 kg |
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Mold Type |
Green Sand Mold, Shell Mold Sand Casting |
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Machining Service |
CNC Turning, Milling, Drilling, Threading |
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Surface Treatment |
Painting, Powder Coating, Sand Blasting, Zinc Plating |
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Heat Treatment |
Annealing, Quenching, Tempering, Normalizing |
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Packaging |
Bubble + Carton + Wooden Case |
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Shipping |
We have long-term partnerships with DHL, UPS, FedEx, TNT, and EMS, and can arrange air or sea freight for large orders. |
RMC was founded in 1999 by our founding team based in Qingdao, Shangdong, China. With its foundry and machining workshop also in Shandong province, we have now grown to become one of the finest metal forming companies with processes of sand casting, lost wax casting (investment casting), shell mold casting, lost foam casting, vacuum casting, precision forging, machining and post-processes such as surface treatment and heat treatment.
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